The good thing about having friends and even family all over the country is that you can always visit someone on the weekend. This one I visited my cousin who lives in Frankfurt for have a year.
What impressed me most about the Main Metropole was the strong contrast between old and modern. You find some very old, maybe medieval houses, and then, you have this big skyscrapers in the background. I love the fact that Frankfurt has something like a skyline and I loved it even more to watch it at sunset and at night.